IFR COM-120B Service Manual

STEP PROCEDURE
13.
Set
Audio Analyzer
to
measure Distortion with
all
filters
off
.
14. Verify Audio
Analyzer
reads
approximately
10% Distortion.
15. Press
MTRS Instruments
Key
(4).
16.
Select
Distortion Meter
Operation.
17.
Set Distortion Meter
Source to
AUDIO/DATA-IN.
18.
Set
Peak Hold
to OFF.
19.
Set
Average
to OFF.
20.
Set
Low-Pass Filter
to
20 kHz.
21. Verify Distortion
Meter
Reading
matches Audio Analyzer
(10.6%).
lf
not,
go
to
Step
23.
22.
Set COM-1208 Power
to OFF and disconnect test equipment.
PERFORM
THE FOLLOWING
ONLY
WHEN REQUIRED,
23.
Set
Audio
Generator
2 tor 1.41 Vp.
24.
Set
Audio
Generator
1 tor
0.14
Vp.
25.
Press
SETUP
MEMORY Key
(21).
26.
Select
"1.
Calibration"
f rom
Setup Screen.
27. Press ENTER Key
to access
Password Field. Press
SHIFT,
F, M, Y,
S,
V,
C, D and
SHIFT
Data
Entry Keys
(5).
Press ENTER Key.
28.
Select
"2.
O ISTORTION METER"
to access DISTORTION METER
CALIBRATION
Screen.
29. Enter Audio Analyzer Reading
using DATA ENTRY Keys
(5).
Press
ENTER Key.
30. Go to Step
15.
1-15
STEP PROCEDURE
13. Set Audio Analyzer to measure Distortion with all filters off.
14. Verify Audio Analyzer reads approximately 10% Distortion.
15. Press MTRS Instruments Key (4).
16. Select Distortion Meter Operation.
17. Set Distortion Meter Source to AUDIO/DATA-IN.
18. Set Peak Hold to OFF.
19. Set Average to OFF.
20. Set Low-Pass Filter to 20 kHz.
21. Verify Distortion Meter Reading matches Audio Analyzer (iO.6%). If not, go to Step 23.
22. Set COM-120B Power to OFF and disconnect test equipment.
PERFORM THE FOLLOWING ONLY WHEN REQUIRED.
23. Set Audio Generator 2 for 1.41 Vp.
24. Set Audio Generator 1 for 0.14 Vp.
25. Press SETUP MEMORY Key (21).
26. Select "1. Calibration" from Setup Screen.
27. Press ENTER Key to access Password Field. Press SHIFT, F, M, Y, S, V, C, D and SHIFT
Data Entry Keys (5). Press ENTER Key.
28. Select "2. DISTORTION METER" to access DISTORTION METER CALIBRATION Screen.
29. Enter Audio Analyzer Reading using DATA ENTRY Keys (5). Press ENTER Key.
30. Go to Step 15.
1 -15
Scans by ArtekMedia © 2008

IFR COM-120B Specifications

General

Brand	IFR
Model	COM-120B
Category	Measuring Instruments
Language	English